Modbus Protocol for ION 7500, ION 7600 and ION 8000 series

The Record Number is returned as an unsigned 32-bit value stored in two Modbusregisters. The first register is the high order followed by the low order secondregister.The Time Stamp Seconds is returned as an unsigned 32-bit value stored in twoModbus registers. The first register is the high order followed by the low ordersecond register. The format is UNIX time (UTC). Consult the online IONProgrammer’s Reference for a description of the Clock Module time format.The Time Stamp MicroSeconds is returned as an unsigned 32-bit value stored intwo Modbus registers. The first register is the high order followed by the loworder second register. The format is absolute time in micro seconds.The Source Input Data is returned as a Float value stored in two Modbus registers.The first register is the high order followed by the low order second register. Theformat is IEEE-754.The following is an example of a Data Recorder Module with one source inputconnected (14 records maximum):Modbus Register# of ModbusRegistersDescription Format Properties43012 2 Record Number (x) UINT32 Read43014 2 UTC Seconds UINT32 Read43016 2 UTC MicroSeconds UINT32 Read43018 2 Source 1 Input Data FLOAT Read43020 2 Record Number (x+1) UINT32 Read43022 2 UTC Seconds UINT32 Read43024 2 UTC MicroSeconds UINT32 Read43026 2 Source 1 Input Data FLOAT Read43116 2 Record Number (x+13) UINT32 Read43118 2 UTC Seconds UINT32 Read43120 2 UTC MicroSeconds UINT32 Read43122 2 Source 1 Input Data FLOAT Read